PHP-Dynamics Cache Service is pretty simplistic. It only provides an interface, Dynamics_Cache_Interface, and anything implementing it can be used as a Dynamics cache backend.
PHP-Dynamics does not provide any real world implementation for this, and is using the mock implementation Dynamics_Cache_NoCache by default.
Note
If you don’t have a cache backend implementation in your current framework, you can use existing adapters for major PHP frameworks.
See also